High impact strength powder metal part and method for making...

Details High impact strength powder metal part and method for making... High impact strength powder metal part and method for making...

C - Chemistry, Metallurgy

22

C

75/163, 75/1.3

C22C 1/02 (2006.01) B22F 3/16 (2006.01) B22F 3/26 (2006.01) B32B 15/01 (2006.01) C22C 33/02 (2006.01)

Patent

CA 1297705

ABSTRACT: A copper infiltrated ferrous powder metal part infiltrated with copper or a copper alloy characterized as having after infiltration a residual uninfiltrated porosity of less than about 7 volume percent and a maximum pore size of the residual uninfiltrated porosity of less than about 125 micrometers, said porosity and pore size values being taken from a worst field of view in a functionally critical area of said metal part. Preferably, the part has an overall density of at least 7.50 g/cm3 and a diffusion depth of copper into the steel matrix of less than about 4 micrometers as determined by chemical etching or less than about 8 micrometers as determined by electron dispersive X-ray analysis (EDXA).

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